A Study Of Roller Path Plan And Feed Ratio Optimization Of Die-less Spining Based On Machining Amount

Spinning is a special technical process of plasticity forming,more and more attention has been paied to it because of its advantages of chipless machining,high precision,low power-consumption.In this paper,according to the lack of representation of machining amount in die-less spinning,firstly,roller path plan and varying feed ratio based on bending amount and hoop strain amount has been compared,their respective advantages and disadvantages can be obtained.Then,resultant amount can be deduced,finally,tests about roller path and varying feed ratio based on resultant amount have been designed,which verifies the effectiveness of roller path plan and varying feed ratio based on resultant amount.This paper is divided into six chapters,the main contents are as follows:In chapter 1,spinning is introduced,the research background and significance of die-less spinning are expounded and research status is given.The main research contents and framework are introduced.In chapter 2,hoop strain and bending amount is introduced,the experiment platform and related parameters are given,finite element explicit dynamical theory applied in spinning simulation is summarized and the selection of relevant parameters in the simulation software is given.In chapter 3,the relationship between roller path plan and forming quality based on two different machining amount is compared.The ideal shape curve and process parameters are controlled to be invariant.Tests based on equal bending amount and hoop strain have been designed,the result shows that equal bending amount planning way can get higher shape precision but larger thickness reduction.The roller path planning is optimizated by increasing the final pass amount based on bending amount and hoop strain,the result shows that optimization based on hoop strain can improve shape precision greater.In chapter 4,the relationship between varying feed ration and forming quality based on two different machining amount is compared.The ideal shape curve and process time are controlled to be invariant.Pass-pass varying feed ratio tests and in-pass varying feed ratio tests based on equal bending amount variation,hoop strain variation have been designed,the result shows that equal bending amount varying feed ratio way can get higher shape precision but larger thickness reduction.Pass-pass varying feed ratio way is optimizated by increasing the final pass machining time and in-pass varying feed ratio way is optimizated by increasing the number of pass that applied in-pass varying feed ratio,the result shows that optimization based on bending amount can get higher shape precision but larger thickness reduction.In chapter 5,roller path plan and varying feed ratio based on resultant amount is proposed.According to bending amount and hoop strain amount,the formula of resultant amount is deduced,roller path is planned by equal resultant amount and optimizated by increasing final pass amount,the result shows that path plan and optimization of path plan based on resultant amount can get best shape precision and decrease the reduction of wall thickness.Pass-pass varying feed ratio and optimization of increasing final pass amount tests and in-pass varying feed ratio and optimization of increasing number of in pass varying feed ratio pass tests based on equal resultant amount variation have been designed,the result shows that varying feed ratio way based on resultant amount can get best shape precision and improve the wall thickness at the same time.In chapter 6,the main research results of this paper are summarized,the shortcomings of the research are given,and the future work and research direction are discussed.